Making 43K of room for landing ICU64.

Size Change (on x64.release)
D8 before 23,683,192
D8 after 23,639,296
Reduce 43,896 bytes

Bugs: v8:8348

Change-Id: I057f7d59e955a2e5e017873e5b3b5daf5b142ae2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1478710
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60616}